My truck will not fire immediatly without ether. Once the ether gets it started it runs for a few seconds then dies. I just replaced the fuel pump and all the lines seem to be clear. What's keeping it from running?

The pump comes on we can hear it. We were thinking also that there might not be enough pressure building up in the system. so we're gonna pressure check it tomorrow. I kinda think the pump might be a dud.The pump comes on we can hear it. We were thinking also that there might not be enough pressure building up in the system. so we're gonna pressure check it tomorrow. I kinda think the pump might be a dud.

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Because it is not getting any fuel! as soon as the ether burns up if no fuel then it quits. check all fuses and relay for fuel pump. to check fuel pump to see if its running. have someone turn the key to start, while somebody is under car at fuel tank. hold hand on tank, if it works you will feel the vibration from pump. most relays for fuel pump are in under hood fuse box. a fuel pump if good, will only run a few seconds to build up pressure in line. when engine starts it runs continuously. so you may have to turn key on a few times. Good-Day!

Check the spark, remove the fuse to the fuel pump and remove one of the spark plugs. Connect the plug to its lead and position it well away from the engine against the truck frame (do not hold it) and turn the engine over, check the spark. If no spark it most probably a faulty coil. Check the impedance of the spark plug leads and replace any that are much higher than the rest.
My guess is that you have spark but no fuel, What?... OK this is what I think is wrong. Your pump is fine when at position 2 on the ignition switch however when you switch to position three to fire the engine the power to the fuel pump is momentarily disconnected. A leaking fuel pressure regulator or injector would drop the pressure in the fuel line and at the same time flood the engine making it impossible to start. Once you start the engine with ether the ignition is back to position 2 and the pump can make good any loss in pressure but because the intake mix is rich this will cause the engine to run rich too.
A good fuel system is capable of delivering 40 - 50PSI of fuel pressure and when switched off up to 90% of this pressure should be maintained for about 5 minutes, if it cannot check out the fuel pressure regulator and injectors. The fuel pipe should be capable of filling a pint pot in about 15 seconds, if it cannot check out the fuel filter is clogged.
Hope the above gives you some pointers

Try spraying a little ether in the throttle body/carb and if it starts and runs for a little bit then dies then you have a fuel problem. Probably a pump or fitler. If you replace the pump also replace the filter. Note: if you are trying to start it with the ether in it and its not starting and you see a little fire keep turning it over to **** the fire into the engine, etherwise you will burn up your glaskets.

You need to follow a detailed troubleshooting procedure in a repair manual.
Check for spark plug fire during cranking after it dies.
No spark = ignition problem= computer will not fire injectors, and possibly cut out pump also.
Good spark = pump wonky, or power to pump system.
Also, other quick tests... when the thing dies, and then you crank,
1) Thump the fuel pump in the tank, if you can. A bad fuel pump might start up again.
2) Shoot some ether carb cleaner in the TB. If it only fires off the ether, the ignition system is no longer suspect.